Radio apparatus



E. E. HOBBS RADIO APPARATUS April 29-, 1930.

Filed Feb. 4, 1928 2 Sheets-Sheet 1 INVENTOR. 4 EcZw,/'ro E. 302265,

April 29, 1930. E. 0555 RADIO APPARATUS Filed Feb, 4, 1928 2 Sheets-Sheet 2' INVENTOR.

Edwin E H5555.

Patented Apr. 29, 1930 UNITED STATES EDWIN E. HOBBS, or rnnnrnlvnnncn, Kansas RADIO Armin-Anus Application filed February 4, 1928. Serial N 'o. 251,793.

My invention relates to improvements in radio apparatus, and refers particularly to means for eliminating static in radioapparatus.

One object of my invention is the provision of static eliminating means'adapted to be connected between the antenna and the input terminal of the radio receiving set and in the ground lead to the set.

Another object of my invention is the pro- Vision of means for eliminating static which will operate perfectly under all conditions and which Will be of simple, inexpensive and durable construction to insure a practical and hi hly desirable invention of this character.

% Vith the objects stated inview, my invention consists of static preventing or eliminating means for radio apparatus embodying novel features of construction, combination and arrangement of parts for service, substantially as described and claimed and as shown in the accompanying drawings, in which:

Figure 1 represents a side elevation of a complete radio apparatus constructed in accordance with and embodying my invention.

Figure 2 represents a horizontal sectional ment, which consists of the metal casing 17 View of the antenna of my invention.

Figure 3 represents a vertical central sectional View of said antenna.

Figure 4 represents a vertical central sectional view of the static eliminating unit of my invention.

Figure '5 represents a vertical central sectional View of the grounding unit of my invention.

Figure 6 represents a top plan view of the said ground element, and

Figure 7 represents a view of the apparatus operatively connected to a receiving set.

In carrying my invention into effect I employ a tubular post of metal 1, which is of the desiredand proper height and is braced by inclined guy wires or braces 2, which are connected at their upper ends 3, to the insulated ring 4, and are anchored at their lower ends 5, and upon the top of said post or tubular column is secured the antenna,

\which consists of a two part drum or casg 66 in the top of which is secured the sleeve 7 with which is connected} thesegmentally or radially arranged arms 8, which lead out from the drum or'casing'and having the extended ends 9, which form the receiving means of the antenna.

The construction of the antenna is most clearly shown in Figures 2-and 3 andfthelead wire 10 is=connected to the plug 11 secured in thetop'or upper end of the post, and said lead wire passes down in'the post and through the insulated opening 12, to thecasa ing 18, the lead or conducting wire having" formed-thereon the coil 14c, which is bareor free of insulation and said coil'is immersed 1n achemical COmpOS1t101l,flIl(l I have found.

from experience that the best resultsare'ob tained by using a composition of calcinated water, ammon1a,parafine oil, alumand rosin. The structure described comprlslng the coil, the casing and the composition forms the staticeliminator, one of the essential features of my invention, and the lead wire has its outer end 15, passing from the eliminator to the set 15, and this portion of the wire may lead directly to the set, as shown in Figure 7, or may be bridged at 16, to the ground wire 17, leading to the ground unit or elehaving its open end fittingin the box or closure 18, and said box is partially filled with a composition of tar, cement, soil or clay, glass, sand, and the bottom, sides and top of the said box are made of any suitablematerial.

From the foregoing description taken in connection with the drawings the operation of my invention will be readily understood, and it will be evident that the current enters the lead in wires of the antenna to the conduct-ing wire and passes through the coil to the set and from the set through the wire to the ground as usual in all radio receiving apparatus, and the static is eliminated by the coil and the mineral in the casing forming the eliminator.

The eliminator consisting of the casing, the bare coil and the chemical charge forms a most important feature of my invention in its relation to the other parts of my invention, and it will be apparent that my apparatus can be easily and cheaply constructed and will operate in an efficient and practical manner for the purpose intended.

' I claim:

7 1. In static eliminator, the combination of a support, an antenna associated therewith,

insulated portion of said conducting wire leading from said casing to a set, a ground element composed of a closed metal casing,

. insulating means therefor,a filling in said casing and surrounding box, and a wire leading to said casing from a set.

2. In radio apparatus, the combination with an antenna and receiving set, of astatic preventing means disposed adapted to beconnected between the antenna and the input to said set, and consisting of a casing contain- 7 ing a suitable liquid, a member immersed in the liquid in said containerand consisting of a metal conductor whose surface. has a portion exposed to said liquid and which conductor is connectedin circuit between the antenna and receiving set, said portion being formed with a coil.

In testimony whereof I hereunto aflix my signature. V EDWIN E. HOBBS. 

